stegdetect - Detect and extract steganography messages inside JPEG

Stegdetect is an automated tool for detecting steganographic content in
images. It is capable of detecting several different steganographic
methods to embed hidden information in JPEG images. Currently, the
detectable schemes are jsteg, jphide, invisible secrets, outguess 01.3b,
F5, appendX, and camouflage. Using linear discriminant analysis, it also
supports detection of new stego systems. Stegbreak is used to launch
dictionary attacks against JSteg-Shell, JPHide, and OutGuess 0.13b.